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Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection

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  • Zhaojie Shen

    (School of Automotive Engineering, Harbin Institute of Technology, Weihai 264209, China
    School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Wenzheng Cui

    (School of Automotive Engineering, Harbin Institute of Technology, Weihai 264209, China)

  • Xiaodong Ju

    (School of Automotive Engineering, Harbin Institute of Technology, Weihai 264209, China)

  • Zhongchang Liu

    (State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130025, China)

  • Shaohua Wu

    (School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)

  • Jianguo Yang

    (School of Automotive Engineering, Harbin Institute of Technology, Weihai 264209, China)

Abstract

External exhaust gas recirculation (EGR) stratification in diesel engines contributes to reduction of toxic emissions. Weak EGR stratification lies in that strong turbulence and mixing between EGR and intake air by current introduction strategies of EGR. For understanding of ideal EGR stratification combustion, EGR was assigned radically at −30 °CA after top dead center (ATDC) to organize strong EGR stratification using computational fluid dynamics (CFD). The effects of assigned EGR stratification on diesel performance and emissions are discussed in this paper. Although nitric oxides (NO x ) and soot emissions are both reduced by means of EGR stratification compared to uniform EGR, the trade-off between NO x and soot still exists under the condition of arranged EGR stratification with different fuel injection strategies. A deterioration of soot emissions was observed when the interval between main and post fuel injection increased, while NO emissions increased first then reduced. The case with a 4 °CA interval between main and post fuel injection is suitable for acceptable NO and soot emissions. Starting the main fuel injection too early and too late is not acceptable, which results in high NO emissions and high soot emissions respectively. The start of the main fuel injection −10 °CA ATDC is suitable.

Suggested Citation

  • Zhaojie Shen & Wenzheng Cui & Xiaodong Ju & Zhongchang Liu & Shaohua Wu & Jianguo Yang, 2018. "Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection," Energies, MDPI, vol. 11(3), pages 1-14, February.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:515-:d:133839
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    References listed on IDEAS

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    Cited by:

    1. Jingrui Li & Jietuo Wang & Teng Liu & Jingjin Dong & Bo Liu & Chaohui Wu & Ying Ye & Hu Wang & Haifeng Liu, 2019. "An Investigation of the Influence of Gas Injection Rate Shape on High-Pressure Direct-Injection Natural Gas Marine Engines," Energies, MDPI, vol. 12(13), pages 1-18, July.
    2. Giorgio Zamboni, 2018. "A Study on Combustion Parameters in an Automotive Turbocharged Diesel Engine," Energies, MDPI, vol. 11(10), pages 1-21, September.
    3. Lu, Zhen & Liu, Mengyu & Shi, Lei & Wang, Tianyou & Lu, Tianlong & Wang, Huaiyin, 2022. "Numerical research of the injected exhaust gas recirculation strategy on a two-stroke low-speed marine diesel engine," Energy, Elsevier, vol. 244(PA).

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